海康回调函数传参

cam_no是参数，直接强转

  

   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      PLATFORMSDK_API int Plat_VSS_PlayVideo_V20(_IN_ int iUserHandle, _IN_ const char* pszCamIdx, _IN_ long hWnd, _OUT_ unsigned int* puiHandle,
     
    
   

    

     

    
    

     

       _IN_ StreamCallback_V20 fStreamCallback = 0, _IN_ PreviewMsgCallback_V20 fMsgNotify = 0, _IN_ void* pUser = 0);
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      传参：
     
    
   

    

     

    
    

     

      int cam_no=5;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      int iRet = Plat_VSS_PlayVideo_V20(g_iLogHandle, deviceId, NULL,
     
    
   

    

     

    
    

     

      			&m_uiPlayHandle, pDlg->CB_StreamCallback, CB_PreviewMsgCallback, (void*)cam_no);
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      接收参数：
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      void __stdcall Chik_serverDlg::CB_StreamCallback(long handle, int iStreamType, const char* data, int size, void* pUser)
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     
	if (iStreamType != 2) {
     
    
   

    

     

    
    

     
		return;
     
    
   

    

     

    
    

     

      	}
     
    
   

    

     

    
    

     

      	HWND mhWnd = (HWND)handle;
     
    
   

    

     

    
    

     
	int  cam_no = (int)pUser;
     
    
   

    

     

    
    

     

    
  
 

在大华的sdk中，直接强转会报错，

大华sdk中

int param_data=56;

LDWORD d_data=param_data;

后来把这个参数传过去，也能用。

文章来源: blog.csdn.net，作者：网奇，版权归原作者所有，如需转载，请联系作者。

原文链接：blog.csdn.net/jacke121/article/details/101013309